combine-diff: diff-files fix (#2)

The raw format "git-diff-files -c" to show unmerged state forgot
to initialize the status fields from parents, causing NUL
characters to be emitted.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff-files.c

@@ -150,6 +150,8 @@ int main(int argc, const char **argv)
 					       nce->sha1, 20);
 					combine.p.parent[stage-2].mode =
 						DIFF_FILE_CANON_MODE(mode);
+					combine.p.parent[stage-2].status =
+						DIFF_STATUS_MODIFIED;
 				}
 
 				/* diff against the proper unmerged stage */